// ButtonDelegate.h
class ButtonDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
explicit ButtonDelegate
(QObject *parent
=0);
~ButtonDelegate();
protected:
private:
};
// ButtonDelegate.cpp
ButtonDelegate
::ButtonDelegate(QObject *parent
) : QStyledItemDelegate
(parent
){
button->setFixedWidth( 50); // I'm setting this in pixels. There has to be a better way.
button->setPalette(pal);
label->setTextFormat(Qt::RichText);
label->setWordWrap(false);
}
//HistoryTreeView.h
{
public:
HistoryTreeView
(QWidget *parent
= 0);
protected:
void enterEvent
( QEvent * event
);
void leaveEvent
( QEvent * event
);
private:
int m_currentRow;
};
//HistoryTreeView.cpp
void HistoryTreeView
::mouseMoveEvent(QMouseEvent *event
) {
// Only do something when a model is set.
if (m)
{
if (index.isValid())
{
// if the mouse has moved to another row
if (index.row() != m_currentRow)
{
m_currentRow = index.row();
// TODO: clear all rows
QModelIndex itemIndex
= m
->sibling
(m_currentRow,
0, index
);
QWidget * item
= indexWidget
(itemIndex
);
Q_ASSERT(item != NULL );
}
}
else // model is invalid
{
m_currentRow = -1;
}
}
}
//HistoryWindow.h
{
Q_OBJECT
public:
explicit HistoryWindow
(QWidget *parent
= 0);
~HistoryWindow();
void setupModel();
void SetMouseTransitSignals
(QWidget *parent
);
protected:
private:
Ui::HistoryWindow *ui;
HistoryItemModel *model;
HistoryTreeView *treeView;
void setupData();
void createModelAndView();
};
//HistoryWindow.cpp
void HistoryWindow::createModelAndView()
{
setupModel();
ui->treeView->setItemDelegateForColumn(0, new ButtonDelegate);
ui->treeView->setAllColumnsShowFocus(true);
ui->treeView->setModel(model);
SetMouseTransitSignals(this);
}
void HistoryWindow
::SetMouseTransitSignals(QWidget *parent
) {
// enable mouse tracking for the treeview.
ui->treeView->setMouseTracking(true);
}
void HistoryWindow
::enterEvent(QEvent*e
) {
}
// ButtonDelegate.h
class ButtonDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
explicit ButtonDelegate(QObject *parent=0);
~ButtonDelegate();
void paint( QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const;
QSize ButtonDelegate::sizeHint( const QStyleOptionViewItem &option,
const QModelIndex &index) const;
void unpolish(QWidget *widget);
void polish(QWidget *widget);
void paintWidget( QPainter *painter,
const QRect &rect,
const QString &cacheKey,
QWidget *widget ) const;
protected:
void enterEvent ( QEvent * );
void leaveEvent ( QEvent * );
private:
mutable QTextDocument document;
QPushButton *button;
QLabel *label;
};
// ButtonDelegate.cpp
ButtonDelegate::ButtonDelegate(QObject *parent) : QStyledItemDelegate(parent)
{
button = new QPushButton( "Wild!");
button->setFixedWidth( 50); // I'm setting this in pixels. There has to be a better way.
QPalette pal = button->palette();
pal.setColor(QPalette::ButtonText, QColor(255, 0, 0));
pal.setColor(QPalette::Button, QColor(255, 255, 0));
button->setPalette(pal);
label = new QLabel;
label->setTextFormat(Qt::RichText);
label->setWordWrap(false);
}
//HistoryTreeView.h
class HistoryTreeView : public QTreeView
{
public:
HistoryTreeView(QWidget *parent = 0);
protected:
virtual void mouseMoveEvent(QMouseEvent *event);
void enterEvent( QEvent * event );
void leaveEvent( QEvent * event );
private:
int m_currentRow;
};
//HistoryTreeView.cpp
void HistoryTreeView::mouseMoveEvent(QMouseEvent *event)
{
QAbstractItemModel *m(model());
// Only do something when a model is set.
if (m)
{
QModelIndex index = this->indexAt(event->pos());
if (index.isValid())
{
// if the mouse has moved to another row
if (index.row() != m_currentRow)
{
m_currentRow = index.row();
// TODO: clear all rows
QModelIndex itemIndex = m->sibling(m_currentRow, 0, index );
QWidget * item = indexWidget(itemIndex);
Q_ASSERT(item != NULL );
}
}
else // model is invalid
{
m_currentRow = -1;
}
}
QTreeView::mouseMoveEvent(event);
}
//HistoryWindow.h
class HistoryWindow : public QMainWindow
{
Q_OBJECT
public:
explicit HistoryWindow(QWidget *parent = 0);
~HistoryWindow();
void setupModel();
void addFile( QStandardItemModel *model,
const QString &anAttribute,
const QString &anotherAttrib,
const QString &path,
const QString &datestamp,
const QString &text );
void SetMouseTransitSignals(QWidget *parent);
protected:
void enterEvent(QEvent*);
void leaveEvent(QEvent*);
private:
Ui::HistoryWindow *ui;
HistoryItemModel *model;
HistoryTreeView *treeView;
void setupData();
void createModelAndView();
};
//HistoryWindow.cpp
void HistoryWindow::createModelAndView()
{
setupModel();
ui->treeView->setItemDelegateForColumn(0, new ButtonDelegate);
ui->treeView->setAllColumnsShowFocus(true);
ui->treeView->setModel(model);
SetMouseTransitSignals(this);
}
void HistoryWindow::SetMouseTransitSignals(QWidget *parent)
{
// enable mouse tracking for the treeview.
ui->treeView->setMouseTracking(true);
}
void HistoryWindow::enterEvent(QEvent*e)
{
QWidget::enterEvent(e);
}
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indexWidget() unexpectedly returns a NULL pointer.
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Originally Posted by ajax
You were active pretty late last night. I'm impressed. 
aint() provides. There is one delegate (hence one label of yours) and say.... 1000 items in the model so is your label showing one text or 1000 different texts?
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